I do not have the Bose, but do have OnStar/XM. I was getting the feeling that my speakers were not delivering full potential, then realized this. I have found very basic wiring color coding w/o tweeters. The ones I find with tweeters are not specific to Impala / have no pictures of head unit and have a vast amount of little differences or major differences.

I did not want to pop the stereo out until I know for sure I have a specific diagram for my Impala, because I am sure splitting connections meant for 2 speakers to 4 is a huge hit to my sound performance. Also, based on what I can tell is the reason my chimes are nonexistent/so quiet you would need dog ears. Any help would be awesome!

The tweeters just run off of the same "channel" as the door speakers - they are not separate. The rear speakers have their own channel and the front channel is for the door speakers and the tweeters. Not sure how you are getting the tweeters on their own channel like that - sound like the wiring is not done right on the head-unit.

I finally replaced my driver's side door speaker. I dunno that I did it too properly seeing as it started acting like it was going to pour. Of course, got it working and the passenger side stopped. Rain stopped and I reluctantly replaced it dreading the same consequence. Cheap $30 speakers work awesome.

Anyways, I found that all these door panel removal tutorials say to use a towel and a screwdriver, found this to be very ineffective. What I ended up doing was pulling the panel up over the lock and then using my hands to pop out the fasteners by pulling it towards me.

No issues at all and it was off in a matter of seconds. I basically just used a box to prop the panel on, because I could not get the handle cord to release as easily as I had seen. All I needed was the speaker anyways.

What about the Impalas with under seat storage? I'm planning on undertaking this rear speaker replacement task sometime tomorrow. It looks like the under seat storage folds away the bottom seat far enough to be able to remove the seat back without all the extra steps.

The speaker adapters mentioned above are actually a little different than the Scosche adapters - so it's possible that they are better quality (they do look a littler "sturdier"). However, the biggest benefit of the Hummer brackets are that they have the little "roof" that covers the speaker from falling water, etc (in case water would get into the door) - just like the stock bracket has - and more importantly, they have the foam going around the front of the adapter, which helps avoid any sound loss into the doors - it basically create somewhat of a "seal" between the speaker and the speaker grille that is built into the door - just like the factory speaker does. They also have a thin layer of foam on the back, where the bracket meets the door, which is nice (may help to avoid rattles, etc). It's just a better overall solution, in my opinion.

Kinda curious to see how these newer-style brackets work out too though...

Here are some pictures of the Hummer speakers where you can see the foam (front and back) and the "roof" that I'm talking about. I would imagine that the "roof" may also help the sound quality as well...

I got the ebay ones and they look to be fairly solid not flimsy no roof or foam but I am considering laying up a fiberglass bowl for the speakers and adding so poly fill I did this on my dime a few years back and it worked out well, as for the foam weather stripping is fairly cheap since that's all the foam is to begin with...more to come as the pile is building.....hehehe